A patient is being treated for shock. The nurse knows that shock is a clinical syndrome characterized by which physiologic state?

Hypotension

Severe infection

Inadequate tissue perfusion

Loss of blood

Answer and Explanation

The Correct Answer is C

A. Hypotension: Although hypotension commonly occurs in shock, it is not the defining feature of the syndrome. Early compensatory mechanisms such as vasoconstriction and tachycardia may temporarily maintain blood pressure despite worsening cellular hypoxia. Shock can therefore exist even when blood pressure is within normal limits.

B. Severe infection: Severe infection is a cause of septic shock, which is one subtype of shock. However, shock can also result from hypovolemia, cardiogenic failure, or obstructive processes. Infection describes an etiology rather than the underlying physiologic state common to all forms of shock.

C. Inadequate tissue perfusion: Shock is fundamentally characterized by insufficient tissue perfusion leading to impaired oxygen delivery at the cellular level. This results in anaerobic metabolism, lactic acidosis, and progressive organ dysfunction. The hallmark of shock is failure of the circulatory system to meet metabolic demands.

D. Loss of blood: Blood loss is the primary cause of hypovolemic shock but does not define shock as a whole. Other types, such as cardiogenic or distributive shock, occur without hemorrhage. The unifying feature across all types is impaired cellular oxygenation due to inadequate perfusion.

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Correct Answer is C

Explanation

A. Decreased seizure activity: Mannitol does not have anticonvulsant properties. While reducing intracranial pressure may indirectly reduce seizure risk in some patients, its primary mechanism is not seizure control, so this is not the expected therapeutic outcome.

B. Decreased inflammatory response: Mannitol does not act on inflammatory pathways. It is an osmotic diuretic and does not reduce inflammation in brain tissue or systemic conditions. Anti-inflammatory medications are used for that purpose.

C. Decreased cerebral edema: Mannitol is an osmotic diuretic that draws water out of edematous brain tissue into the intravascular space, reducing intracranial pressure. This decrease in cerebral edema improves cerebral perfusion and oxygenation, which is the primary therapeutic goal in unconscious patients with increased intracranial pressure.

D. Decreased cerebral metabolism: Mannitol does not directly alter cerebral metabolic rate. Interventions like hypothermia or sedatives affect cerebral metabolism, but mannitol’s effect is through osmotic fluid shifts rather than metabolic modulation.

Correct Answer is []

Explanation

Rationale for correct choices

• Cardiogenic shock: The client presents with hypotension, tachycardia, low oxygen saturation despite 100% FIO2, frothy pulmonary secretions, and diminished breath sounds, all indicating fluid overload and poor cardiac output. ABG shows hypoxemia and respiratory acidosis, consistent with pulmonary edema from cardiogenic shock. These findings, together with the need for mechanical ventilation and sedative support, point toward impaired cardiac function leading to shock rather than a primary respiratory or thrombotic problem.

• Elevate the head of the bed: Elevating the head of the bed helps improve ventilation and oxygenation by reducing pulmonary venous return and promoting lung expansion. In a patient with pulmonary edema secondary to cardiogenic shock, this position decreases the work of breathing and helps mobilize secretions for more effective suctioning.

• Implement hemodynamic monitoring: Continuous hemodynamic monitoring allows the nurse to track blood pressure, cardiac output, and perfusion status, which are critical in cardiogenic shock. This monitoring enables early detection of further deterioration and guides titration of fluids, vasoactive drugs, and inotropic support. It also ensures timely response to hypotension or arrhythmias, which are common complications in shock.

• Oxygen saturation levels: Monitoring oxygen saturation provides immediate feedback on the patient’s respiratory status and effectiveness of oxygen delivery. Hypoxemia indicates worsening pulmonary edema or inadequate ventilation, guiding adjustments in ventilator settings or suctioning frequency. This is essential to evaluate progress and prevent further tissue hypoxia.

• Central venous pressure: Central venous pressure monitoring helps assess intravascular volume and right-sided heart function, providing insight into preload and fluid status. In cardiogenic shock, CVP trends help determine whether fluid resuscitation or diuresis is appropriate, guiding therapy to optimize cardiac output without worsening pulmonary congestion. Tracking CVP assists in evaluating the patient’s response to interventions.

Rationale for incorrect choices

• Pulmonary embolism: Although the patient has hypoxemia and tachycardia, there is no evidence of sudden onset pleuritic pain, unilateral leg swelling, or risk factors for thromboembolism. Pulmonary embolism typically causes acute right-sided strain rather than the frothy pulmonary secretions seen here.

• Status asthmaticus: Status asthmaticus usually presents with wheezing, prolonged expiratory phase, and bronchospasm, which are not noted in the auscultation findings. Diminished breath sounds with frothy secretions suggest fluid overload rather than airway obstruction. The patient’s ABG also shows hypoxemia with hypercapnia, consistent with alveolar flooding.

• Acute myocardial infarction (MI)
While MI can precipitate cardiogenic shock, the client’s presenting features focus on systemic hypotension, pulmonary edema, and decreased perfusion rather than acute chest pain or ECG changes typical of MI. MI may be the underlying cause but does not fully explain the immediate critical status; the priority is managing shock.

• Discontinue intravenous fluids: Fluid restriction may be indicated later, but immediate discontinuation of IV fluids is not the first-line intervention in unstable patients. The nurse must first assess hemodynamics and oxygenation before adjusting fluid therapy, as abrupt cessation could worsen hypotension and perfusion.

• Initiate oral nutrition: Oral nutrition is inappropriate in a sedated, mechanically ventilated patient due to aspiration risk. Nutritional support may be considered later via enteral or parenteral routes once hemodynamic stability is achieved. It is not an immediate action to address cardiogenic shock.

• Insert urinary catheter: A urinary catheter may help monitor urine output in shock, but it is secondary to interventions that directly support hemodynamics and oxygenation. It is not an immediate action to stabilize cardiogenic shock, though it may be implemented for ongoing fluid balance assessment.

• Calcium levels: Calcium levels are not directly relevant to assessing the patient’s cardiogenic shock or respiratory compromise. They do not provide actionable information about oxygenation or fluid status and are not priority parameters for monitoring progress in this scenario.

• Body mass index: Body mass index is irrelevant in the acute ICU setting for cardiogenic shock. It does not reflect immediate changes in cardiac output, oxygenation, or perfusion, and does not guide urgent interventions.

• Capillary refill: Capillary refill may provide a rough estimate of peripheral perfusion, but in critically ill, sedated patients on vasopressors or with hypotension, it is unreliable. Central measures like CVP and continuous oxygen saturation are more accurate for monitoring the patient’s progress.

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A patient is being treated for shock. The nurse knows that shock is a clinical syndrome characterized by which physiologic state?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

The physician prescribes IV mannitol for an unconscious patient. The nurse would expect the therapeutic effect of this drug to result in which outcome?

Correct Answer is C

Explanation

Correct Answer is []

Explanation

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